Praeorbulina sicana De Stefani 1950 (TaxonConcept

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Species Praeorbulina sicana De Stefani 1950

Discussion / Comments:

Bolli & Saunders (1985):
A re study of the holotype of this species has shown that it has 4 apertures around the base of the last chamber (Jenkins et al , 1981 and holotype refigured here as Fig. 24.7). For this reason it is removed to the genus Praeorbulina. Also for this reason and because of the greater envelopment of the test by the last chamber with subsequent complete loss of the umbilicus, the species is not considered to be conspecific with G. bisphericus as has been suggested (Blow, 1969). It is believed to be an intermediate form in the lineage between G. bisphericus and P. glomerosa, curva
Chaisson & Leckie (1993):
Remarks: Kennett and Srinivasan (1983) acceded to the view of Jenkins et al. (1981) that this species is distinct from Globigerinoides bisphericus and belongs in the genus Praeorbulina. Because it is a zonal marker species, we have applied a narrow species concept. In this study, P. sicana must have at least three low apertures at the base of the final chamber (see Jenkins et al., 1981). Similar species: See Globigerinoides sicana/bisphericus. The final chamber of P. sicana tends to be larger and more embracing than G. sicana/bisphericus, and it has at least three apertures at the base of the base of the final chamber, compared with two in the latter taxon.

Systematics:

1
Superregnum Eukaryota
  Regnum Protoctista
   Phylum Ciliophora
    Subphylum Postciliodesmatophora
     Ordo Globigerinida
      Superfamilia Globigerinaceae
       Superfamilia Nonionacea
        Familia Globigerinidae
         Genus Praeorbulina
          Species Praeorbulina sicana

Synonym list:

Chaisson & d'Hondt (2000):

1950 Globigerinoides sicanus De Stefani. - de Stefani : p fig 6

Bolli & Saunders (1985):

1945 Globigerinoides conglobatus Brady. - Cushman & Stainforth : pl.13, fig.6 not G. conglobatus (Brady)

1952 Globigerinoides sicana Stefani. - de Stefani : p.9 not re-illustrated

1985 Praeorbulina sicana De Stefani. - Bolli & Saunders : p.200 figs. 24.7; 7,9,12

Vincent & Toumarkine (1990):

1952 Globigerinoides sicana Stefani. - de Stefani : p.9 (type figure designated as Globigerinoides conglobata of Cushman and Stainforth, 1945, p. 68, pl. 13, fig. 6)

1990 Praeorbulina sicana De Stefani. - Vincent & Toumarkine : p.831 pl. 2, figs, 22-24

Chaisson & Leckie (1993):

1950 Globigerinoides sicanus De Stefani. - de Stefani : p.9 fig. 6

1983 Globigerinoides sicanus De Stefani. - Kennett & Srinivasan : p.62 pl. 13; fig. 4-6

1985 Praeorbulina sicana De Stefani. - Bolli & Saunders : p.199 fig. 24.7

1993 Praeorbulina sicana De Stefani. - Chaisson & Leckie : p.170 pl. 2; fig. 5-6

Stratigraphy - absolute ages:

FAD: 16.4 ± 0 [Ma], Berggren et al. (1995)
LAD: 14.8 ± 0 [Ma], Berggren et al. (1995)

References:

Cushman,J.A. and Stainforth,R.M. (1945):
The Foraminifera, of the Cipero marl formation of Trinidad, British West Indies . Cushman Lab. Foram. Res. Vol. 14 p. 1-75

de Stefani,T. (1950):
Su alcune manifestazoni di idrocarburi in provincia di Palermo e descrizione di Foraminifera nuovi . Plinia, Palermo, Italy Vol. 3

de Stefani,T. (1952):
Su alcune manifestazioni di idrocarburi in provincia di Palermo e descrizione di foraminiferi nuovi. Plinia, Palermo, Italy . Vol. 3(4) p. 1-12

Kennett,J. and Srinivasan,M.S. (1983):
Neogene Planktonic Foraminifera - A Phylogenetic Atlas.

Bolli,H.M. and Saunders,J.B. (1985):
Oligocene to Holocene low latitude planktic foraminifers.
In: Plankton Stratigraphy Eds: Bolli, H.M.Saunders, J.B. p. 155-262

Vincent,E. and Toumarkine,M. (1990):
Neogene planktonic foraminifers from the Western Tropical Indian Ocean, Leg 115.
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 115 Eds: Duncan, R.A..Backman, J.Peterson, L.C. p. 795-836

Chaisson,W.P. and Leckie,R.M. (1993):
High-Resolution Planktonic Foraminifer Biostratigraphy of Site 806, Ontong Java Plateau (Western Equatorial Pacific).
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 130 Eds: Berger, W.H.Kroenke, L.W..Mayer, L.A..et al. p. 137-178

Berggren,W.A.; Kent,D.V.; Swisher,C.C. and Aubry,M.P. (1995):
A revised Cenozoic Geochronology and Chronostratigraphy.
In: Geochronology Time Scales and Global Stratigraphic Correlation, SEPM Special Publication Vol. 54

Chaisson,W.P. and d'Hondt,S.L. (2000):
Neogene planktonic foraminifer biostratigraphy at Site 999, Western Caribbean Sea.
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 165 Eds: Leckie, R.M.Sigurdsson, H.Acton, G.D.Draper, G. p. 19-56

Anonymous: Unedited TaxonConcept data

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